public class Course {
    private String courseId;
    private String courseName;
    private int credit;
    public Course(String courseId, String courseName, int credit) {
        this.courseId = courseId;
        this.courseName = courseName;
        this.credit = credit;
    }
    public String getCourseId() {
        return courseId;
    }
    public String getCourseName() {
        return courseName;
    }
    public int credit() {
        return credit;
    }
}